Nanotubes of NiCo2S4/Co9S8 Heterostructure: Efficient Hydrogen Evolution Catalyst in Alkaline Medium

Basu, Mrinmoyee

doi:10.1002/asia.201801185

Cited by 17 publications

(6 citation statements)

References 37 publications

(37 reference statements)

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“…To understand the enhancement in electrocatalytic activity of Ni(OH) 2 /NiOOH after Fe doping, there are few other parameters like mass activity, electrochemically active surface area (ECSA) are determined . Here mass activity for all the developed catalysts are calculated at a fixed potential of 1.65 V vs. RHE and the observed data are presented in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Results show that both the catalysts are stable with very slight variation in OER current density after 1000 runs (Figure 5a To understand the enhancement in electrocatalytic activity of Ni(OH) 2 /NiOOH after Fe doping, there are few other parameters like mass activity, electrochemically active surface area (ECSA) are determined. [48][49][50] Here mass activity for all the developed catalysts are calculated at a fixed potential of 1.65 V vs. RHE and the observed data are presented in Table 1. The Mass activity of Ni(OH) 2 for Ni(OH) 2 /NiOOH and Fe 0.06 Ni 0.94 (OH) 2 /NiOOH, respectively.…”

Section: Evaluation Of the Electrocatalytic Activity Towards The Oermentioning

confidence: 99%

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Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

2019

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Designing metal hydroxide electrocatalysts with high efficiency to overcome the slow reaction kinetics of the oxygen evolution reaction (OER) is considered as a significant approach for renewable energy resources. We report here a simple methodology to synthesize 2D thin nickel hydroxide/nickel oxyhydroxide sheets that show efficient activity towards OER. Further, by doping with a heteroatom, Fe, thinner sheets of nickel hydroxide/nickel oxyhydroxide are developed, which exhibit enhanced electrocatalytic activity towards OER with high durability. Fe‐doped Ni(OH)2/NiOOH requires only 200 mV overpotential to produce 10 mA/cm2, whereas bare Ni(OH)2/NiOOH needs 290 mV overpotential. Moreover, Fe‐doped nickel hydroxide/nickel oxyhydroxide shows a minimal Tafel value of 48 mV/decade, which is even lower than RuO2/CC (82 mV/decade). X‐ray photoelectron spectroscopy indicates that in the case of Fe‐doped Ni(OH)2/NiOOH, the Ni3+ signal enhances, which indicates the favourable stabilization of Ni3+ in the presence of Fe3+ dopant. Under electrochemical OER conditions, in Fe‐doped Ni(OH)2/NiOOH, Fe3+ species help to generate more Ni3+, which function as the active species. Fe0.06Ni0.94(OH)2/NiOOH shows long‐term stability for at least 24 hours in alkaline medium. This work unveils a green strategy for Fe‐doping in 2D thin sheets of Ni(OH)2/NiOOH, which show improved electrocatalytic activity compared to bare Ni(OH)2/NiOOH. The mechanism of OER activity enhancement after Fe‐doping is proposed here.

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Section: Resultsmentioning

confidence: 99%

Section: Evaluation Of the Electrocatalytic Activity Towards The Oermentioning

confidence: 99%

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

2019

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“…[44,45] The mass activity values for all the catalysts are calculated at a fixed potential of 1.65 V vs. RHE and shown in Table 2. [44,45] The mass activity values for all the catalysts are calculated at a fixed potential of 1.65 V vs. RHE and shown in Table 2.…”

Section: Electrocatalytic Activitymentioning

confidence: 99%

“…The superior activity of CuCo 3 S z /CC nanosheets is further confirmed from the calculation of electrochemically active surface area (ECSA) and mass activity. [44,45] The mass activity values for all the catalysts are calculated at a fixed potential of 1.65 V vs. RHE and shown in Table 2. The as-obtained mass activity values of RuO 2 /CC, Cu 2 CoS z /CC, CuCoS z /CC, CuCo 2 S z /CC, CuCo 3 S z /CC, and CuCo 5 S z /CC are 10.9 A/g, 29.9 A/g, 34.6 A/g, 46.0 A/g, 59.1 A/g, and 55.2 A/g, respectively.…”

Section: Electrocatalytic Activitymentioning

confidence: 99%

Development of Copper Cobalt Sulfide with Cu : Co Ratio Variation on Carbon Cloth as an Efficient Electrode Material for the Oxygen Evolution Reaction

Mahala

Sharma

et al. 2019

ChemElectroChem

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When designing a device for energy conversion, development of a highly active catalyst for OER (oxygen evolution reaction) reaction in alkaline medium is of utmost importance. For energy conversion, herein, we developed copper cobalt sulfide on carbon cloth (CC) using a simple and facile hydrothermal method. A vertically grown 2D sheet-like structure of coppercobalt sulfide is observed using L-cysteine as a sulfur source. An optimized ratio of copper(II) and cobalt(III) and the best sulfur source are found to boost the electrocatalytic activity of mixed metal thiospinel for OER. Several characterization techniques (XRD, Raman, FESEM, TEM, XPS, and ICP-AES) were used to confirm phase purity, morphology, and composition of copper cobalt sulfides. We have established that 2D nanosheets of CuCo 3 S z /CC exhibited superior electrocatalytic performance over bare RuO 2 in 1.0 M KOH solution. It is observed that CuCo 3 S z /CC need only 105 mV overpotential to generate 5 mA/ cm 2 current density. CuCo 3 S z /CC is very stable and able to produce unaltered current density under an applied potential of 1.615 V vs. RHE for 48 h. Electrochemically active surface area calculation is performed for all catalysts to confirm higher electrocatalytic activity. The catalyst, CuCo 3 S z /CC is used in a broad pH region using 0.5 M KOH, saline water, and 0.5 M Na 2 SO 4 electrolyte solution to widen the applicability of water splitting. This work shows an avenue to develop active and durable electrocatalyst for OER without using any noble metal electrocatalyst.[a] C.

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“…Free‐standing RuS x showed identical peaks, indicating the S–GO support did not influence the valence of Ru. The high‐resolution S 2p spectrum (Figure c) showed two main peaks at 163.2 and 164.1 eV, which were assigned to (S–S) 2− 2p 3/2 and S–C 2p 3/2 bands, respectively . In addition, S–C bond signal was also observed in both RuS x /S–GO and S–GO, indicating doping of S into GO 18b.…”

mentioning

confidence: 96%

Amorphous Ruthenium‐Sulfide with Isolated Catalytic Sites for Pt‐Like Electrocatalytic Hydrogen Production Over Whole pH Range

Duan

Wang

et al. 2019

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Electrocatalytic hydrogen evolution reaction (HER) is an efficient way to generate hydrogen fuel for the storage of renewable energy. Currently, the widely used Pt‐based catalysts suffer from high costs and limited electrochemical stability; therefore, developing an efficient alternative catalyst is very urgent. Herein, one pot hydrothermal synthesis is reported of amorphous ruthenium‐sulfide (RuSx) nanoparticles (NPs) supported on sulfur‐doped graphene oxide (GO). The as‐obtained composite serves as a Pt‐like HER electrocatalyst. Achieving a current density of −10 mA cm−2 only requires a small overpotential (−31, −46, and −58 mV in acidic, neutral, and alkaline electrolyte, respectively) with high durability. The isolated Ru active site inducing Volmer–Heyrovsky mechanism in the RuSx NPs is demonstrated by the Tafel analysis and X‐ray absorption spectroscopy characterization. Theoretical simulation indicates the isolated Ru site exhibits Pt‐like Gibbs free energy of hydrogen adsorption (−0.21 eV) therefore generating high intrinsic HER activity. Moreover, the strong bonding between the RuSx and S–GO, as well as pH tolerance of RuSx are believed to contribute to the high stability. This work shows a new insight for amorphous materials and provides alternative opportunities in designing advanced electrocatalysts with low‐cost for HER in the hydrogen economy.

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Nanotubes of NiCo₂S₄/Co₉S₈ Heterostructure: Efficient Hydrogen Evolution Catalyst in Alkaline Medium

Cited by 17 publications

References 37 publications

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Development of Copper Cobalt Sulfide with Cu : Co Ratio Variation on Carbon Cloth as an Efficient Electrode Material for the Oxygen Evolution Reaction

Amorphous Ruthenium‐Sulfide with Isolated Catalytic Sites for Pt‐Like Electrocatalytic Hydrogen Production Over Whole pH Range

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